let students = ['st1', 'st2', 'st3', 'st4', 'naughty st'];

for (let i = students.length - 1; i >= 0; i--) {
  let index = Math.floor(Math.random() * students.length);
  [students[index], students[i]] = [students[i], students[index]];
}

console.log(students);
